What 'Elements' -make a great level?

[rockdet]

Here I come (except not in much detail)

Ian has it all. Good puzzles are those where you can see everything you need to solve it, and trying something won't necessarily cook it up instantly. Sort of why Cloner's Maze and Stress Fracture are amongst my favourite levels.

I don't really care for dodging/extra difficulty at the end, but it has to be consequent. If you have to play a 600 seconds gauntlet before getting there again, then an obvious no.

Generally, I prefer non-linear levels, where you can choose where to start without necessarily having to follow the exact same pattern every time.